找規律,越快!給的越多.1,1,2,3,5{ }13,21,34{ }89

找規律,越快!給的越多.1,1,2,3,5{ }13,21,34{ }89

設第n個數為Xn,n-1=a,n-2=b,則Xn=Xa+Xb
答案依次為8,55忘採納!